Photosynthesis

Sammy is taking notes to study for a test. He wrote out the steps that involve hydrogen during photosynthesis. The steps are shown, but they are not in the correct order. 1 - Water is broken down into oxygen and hydrogen. 2 - Glucose is broken down to be used by plants. 3 - Hydrogen combines with carbon dioxide to form glucose. 4 - Hydrogen enters the plant as part of water. Which lists the correct order of the steps?

4, 1, 3, 2

Which describes the role of oxygen in photosynthesis?

It is a product, so it is released by the plant

Which best explains how photosynthesis is helpful to humans?

It provides oxygen for humans to breathe.

Anton thinks that glucose is a reactant of photosynthesis, but his classmate Jamila disagrees. Who is correct, and why?

Jamila is correct because glucose is a product, not a reactant, of photosynthesis.

Li Ming thinks that chlorophyll is a reactant of photosynthesis, but her classmate Julian disagrees. Who is correct, and why?

Julian is correct because chlorophyll is neither used up nor formed in the chemical reaction of photosynthesis.

The diagram illustrates photosynthesis. Which best describes what is happening in the area marked Y? Oxygen is released into the atmosphere through stomata. Carbon dioxide is released into the atmosphere through stomata. Oxygen is released into the atmosphere through xylem. Carbon dioxide is released into the atmosphere through xylem.

Oxygen is released into the atmosphere through stomata.

Which describes interactions between substances and stomata during photosynthesis?

Oxygen is released through stomata and Carbon dioxide enters stomata.

A scientist follows this procedure to test whether plants have been performing photosynthesis. 1. Place Plant X in a dark closet and Plant Y on a sunny windowsill. 2. Wait several days, then remove a leaf from each plant. 3. Boil leaves in alcohol to remove the chlorophyll. 4. Add a chemical indicator that detects sugars. (Dark purple = sugars are present; dark orange = sugars are not present) What results will the scientist most likely obtain when placing drops of the indicator on the leaves?

Plant X: dark orange Plant Y: dark purple

Jeremy listed the steps involved in one stage of photosynthesis. 1 - Water enters the plant. 2 - Carbon dioxide enters the plant. 3 - Sunlight is captured by the plant. Which label best classifies all three of these steps?

Reactants are gathered in chloroplasts

Which best describes the reactants and products of photosynthesis?

Reactants are taken in from the environment by the plant, and products are formed inside the plant.

Which substance is used by plants as a source of food?

glucose

Xavier drew a diagram to compare the roles of oxygen and hydrogen in photosynthesis. Which label belongs in the area marked X? Enters plant as a part of water Combines with carbon dioxide Is released into air through stomata Is stored in leaves for later use

is released into air through stomata

What are the reactants of photosynthesis?

light energy, water, and carbon dioxide

Where in an equation for photosynthesis does carbon dioxide belong?

on the left side, because it is a reactant

In a chemical reaction, _________________ are the substances present after the reaction.

products

Which is the energy source used to fuel photosynthesis?

sunlight